Find the missing term in the series: 2, 5, 9, 19, 37, ?
A74
B75 ✓ Correct
C51
D61
Correct answer: (B) 75
Explanation
The missing term is 75.
The rule alternates x2 + 1 and x2 - 1.
2 x 2 + 1 = 5, 5 x 2 - 1 = 9.
9 x 2 + 1 = 19, 19 x 2 - 1 = 37.
37 x 2 + 1 = 75.
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